Automatic saw-grinding machine.



No. 630,551. Patented Aug. 8, I899.

.1. McCARTHY.

AUTOMATIC SAW GRINDING MACHINE.

(Application filed Dec. 31, 1898.) (No Model.) 3 Sheets8heet I.

I I I I I I I I I A fill/6722 071 N0. 630,55l. Patented Aug. 8, I899. J. McCARTHY.

AUTOMATIC SAW GRINDING MACHINE.

(Application filed Dec. 8!, 1898.\ (No Model.) 3 Sheets-Sheet 2,

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No. 630,55l. Patented Aug. 8, I899. J. McDARTHY.

AUTOMATIC SAW GRINDING MACHINE.

(Application filed Dec. 31, 189B.)

3 Sheets-Sheet 3 (No Model.)

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. UNITED, STATES PATENT OFFICE.

JAMES MCCARTHY, OF CHICAGO HEIGHTS, ILLINOIS, ASSIGNOR TO THE Q dz C COMPANY, OF CHICAGO, ILLINOIS.

AUTOMATIC SAW-GRINDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 630,551, dated August 8, 1899. Application filed December 31; 1898. Serial No. 700.784. (No model.)

To aZl whom it may concern: Q Be it known that I, JAMES MCCARTHY, a citi-. zen of the United States, residing at Chicago- Heights, county of Cook, State of Illinois, have invented certain new and useful Improvements in Automatic Saw-Grinding Machines, of which the following, taken in con-- My invention relates to that class of ma-' chines designed and arranged for grinding or.

sharpening saw-blades, and particularly to the sharpening of circular saws.

It has for its object, therefore, the organization of a saw-grindin g machine universally adjustable to accommodate saws of varying diameter, thickness of blade, or pitch of teeth and a machine entirely automatic, accurate, and efficient in its operation.

The invention will be hereinafter particu-.

larly described, and pointed out in the claims. In the accompanying drawings, which form part of this specification, and wherein corresponding reference letters and figures indi-;

cate identical parts in the several views, Figure 1 is a side elevation of the invention, comprising the grinding mechanism, the'feeding mechanism, and supporting-frame. Fig. 2 is a top plan view of parts shown by Fig. 1. Fig. 3 is a transverse sectional view taken through the saw-feeding table and correlative parts on the line 3 3, Fig. 2.

tional View of the worm-gearing for recipro cating the saw-holding table.

Reference being'had to the drawings and let-.

ters and figures thereon, A indicates a main supporting-frame or pillow-block, by preference of cast-iron, and surmounted by ordinary journal-boxes B B upon either side of its center, fitted with the usual brasses a a, and containing a drive-shaft C, thus rotatably mounted. Secured to shaft C, as by a set-screw b,-is a driving-pulley D,.by agency whereof power is applied to the machine from a source not shown, and E is a corresponding pulley loosely mounted upon same shaft for receiving a Fig. 4 is also a transverse vertical section taken on the line 4 4 of Fig. .1 through an oil-tight gear-case and part of Fig. 5 is a detached sec-- driving-belt when power is not required and the machine is at rest. At the opposite end of shaft C is removably attached a grindingvwheel F, of emery or similar substance, beveled upon its periphery, as at c, and adapted to rotate at a high rate of speed with its said supporting-shaft.- Intermediate of journal- ,boxes'iB .B there is a worm-screw G, out upon or rigidly secured to shaft C, andthis, together with an intermeshing worm-gear H, is housed by an oil-tight gear-case I, the walls whereof are preferably cast integral with frame A. The top of case I is closed by a cover J, conforming in shape to the outlines of the case and secured by bolts d d d, as best shown by Fig. 2, while through said cover,

and likewise jouruale'd in the bottom of case I, is a vertical arbor e, to which the aforesaid gear His keyed; The protruding upper end of arbor e terminates in a disk K, broken by an undercut surface slot f, within which rests the head 9 of an upstanding wrist-pin it (best shown by Fig. 4) and for purposes that will later appear. Projected from the opposite ,or front side of main frame A, by preference castintegral therewith, at points below boxes B B, are corresponding horizontal brackets L L, slotted longitudinally, as at 2', and constituting supports for an auxiliary frame M, secured thereto by suitable bolts passing through said slots 1'. Extending forward, this frame .M may be supported at its distal end by a suitablelegj and upon its surface bears a Iraised longitudinal dovetailed projection N, forming .a track or way for a reciprocating saw-table nowgto be described.

Oindicates the saw holding and manipulatinggtable, having in its under surface a longitudinal indenture P, coinciding with the surface projection of frame M aforesaid and bearing a reciprocal relation thereto. Within the indenture P and interposed between the table and the projection N of the track or way is a gib N", by means of which and-the set-screws N (see Fig. 1) wear may be taken up as it occurs. From the longitudinal center of table 0 rises an annulus Q, whereon is placed the center hole of a saw to be. ground, and around this the saw is, caused to revolve intermittently when the machine is inopera- Above is located a friction-disk R,

tion.

faced upon its under side with leather or other pliable yielding material, as 70, and provided with dowel-pins Z Z, the latter embedded in said annulus Q, to prevent rotation of the disk, as best shown by Fig.

At the center of annulus Q is a vertical cap-screw S in threaded connection with table 0, shouldered, as at m, for engaging and retaining disk R in position, thus permitting adjustment of said disk with relation to the table for the purpose of clamping a saw more or less firmly between the two. Above shoulder m the body at of screw S is cylindrical, and upon this is loosely journaled an angleiron or extension-arm T, through an aperture in the opposite end of which passes the screwthrcaded end 0 of an operating pitman-rod U, as shown by Figs. and 2. Upon this threaded end 0 of rod U and upon each side of the arm T are lock-nuts p p for retaining said arm in a given position and permitting an extension of the latter according to requirements. The opposite extremity of rod U, by means of a suitable eye q between washers 9' 1', loosely surrounds the protruding wrist-pin 7t aforesaid, as shown, the latter serving to reciprocate the former and dependent parts, as will appear by a statement of operation to follow.

Upon the surface of auxiliary frame M, adjacent to its connection with the fixed horizontal brackets L L, is adjustably mounted a transverse gage-plate V, secured by a bolt or bolts, as s, passing through a longitudinal adjusting-slot If and equipped at its outer end with an automatic saw-revolving mechanism, as will now be set forth. Extending rearwardly from plate V is the body V of said mechanism, slotted, as at u, and terminating in an extension-arm X, the latter also slotted, as at v, and attached by wing-nut w to the side of body V for the purpose of permitting a longitudinal adjustment between the two sections.

Swiveled in lugs a; :0 upon gage-plate V is an adj Listing-screw Y, the latter threaded into the head of a bolt Z, adapted to be adjusted in longitudinal slot to of body W, and bearing at its lower end a bur a for locking it in a given position, while projecting still rearwardly from said bolt Z is a spring-pawl 1, having upon its face a plurality of teeth 2 2 2, in substantial conformity with the teeth of a saw-blade. Interposed between said pawl 1 at its outer end and the corresponding end of armX is a tension-spring 3 for the purpose of keeping said parts normally, but yieldingly, apart and insuring contact at all times between the teeth 2 2 2 and the throat of several teeth upon-the saw-blade.

The foregoing being a description of my invention in its preferred form of construction, it will be noted that I by no means limit or confine myself to the particular arrangement and combination of parts shown. These may be variously modified and changed without departing from the spirit of my invention;

but based upon the disclosures herein made a brief statement'of operation is as follows: Power applied to driving-pulley D is transmitted by shaft C to grinding-wheel F, at same time rotating worm G, fixed to said shaft, Within the walls of gear-case I, also horizontal gear H, in mesh with the latter, its supporting-arbor e, and finally the disk K above, all moving continuously, but at greatly-reduced speed as compared with the wheel F. By means of wrist-pin h, movably secured in an eccentric position upon said disk K, this rotary motion is converted into a slow reciprocal movement and transmitted by agency of pitman-rod U to the saw-holding table 0, moving in a direction at right angles to the axis of wheel F and carrying the saw to be operated upon, the extent of such movement being accurately governed by the degree of eccentricity accorded wristpin it upon its disk K. Resting upon the surface of table 0 a saw undergoing the grinding operation is yieldingly bound beneath friction-disk R by pressure of capscrew S. It is further retained by annulus Q, rising through its center 1101c and constitutinga bearing around which the saw is automatically rotated for the purpose of presenting successive teeth to action of the grinding-wheel. During each forward movement of a saw, as described, the teeth 2 of springprcssed pawl 1 ride over or jump adjacent teeth upon the saw-blade; but upon the reverse or receding movement said teeth cause the saw to rotate slightly, presenting a succeeding tooth for action of wheel F when next advanced. The same process is thus repeated automatically and continuously as long as there are teeth in the saw to be ground.

It will be noted that the depth of grinding action is governed by the throw of pitmanrod U, as stated, and that saws of different diameters may be provided for by the following adjustments: Presuming the saw to be of reduced size, auxiliary frame M is shortened by overlapping brackets L L, and the table 0 is taken up by adjustment of extension-arm T upon the threaded end 0 of rod U, thus bringing the teeth of said saw at one point in its circumference into close proximity with ,the beveled edge of grinding-wheel F.

In order to properly cooperate, the automatic rotating mechanism must be correspondingly adjusted. This is accomplished by a transverse movement of gage-plate V in a direction at right angles to that ascribed to the auxiliary frame M with dependent parts, and, further, by a proportionate shortening of the sectional body V of said saw-revolving mechanism, effected through the agency of wing-nut w and adjusting-screw Y. In like part.

a plurality of feed-teeth 2 are employed upon pawl 1 in order to absolutely insure rotation of the saw at all times, even though, perchance, there be a tooth missing from its periphery, as is sometimes the case.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In an automatic saw-grinding machine the combination with a driving-shaft mounting a grinding-wheel, of worm-gearing positively driven by said shaft, a reciprocating saw-holding table, and a superposed pitmanrod for connecting said table and gearing, substantially as and-for the purposes specified.

'2. In an automatic saw-grinding machine the combination with a driving-shaft mounting a grinding-wheel, of Worm-gearing positively driven by said shaft, a reciprocating saw-holding table bearing a raised saw-centering stud, and a pitman-rod for connecting said table and gearing, substantially as described.

3. In an automatic saw-grinding machine the combination with a driving-shaft mounting a grinding-wheel, of Worm-gearing positively driven by said shaft, a reciprocating saw-holding table bearing a raised saw-centering stud, a cap-screw for binding a saw to the table, and a pitman-rod connecting said table and worm-gearing, substantially as described.

4. In an automatic saw-grinding machine the combination with a reciprocating sawholding table, of a raised saw-centering stud, a yielding friction-disk above said stud, and a cap-screw for binding said table and disk with an interposed saw-blade together, substantially as described.

5. In an automatic saw-grinding machine the combination with a reciprocating sawholding table, of a raised saw-centering annulus, a yielding friction-disk, and a shouldered cap-screw for binding said table and disk with an interposed saw-blade together, substantially as described.

6. In an automatic saw-grinding machine the combination with saw grinding and feeding mechanisms, of a saw-holdin g table bearing a raised saw-centering annulus, a frictiondisk having dowel connections with said annulus, and a cap-screw for binding said disk to the table, substantially as described.

7. In an automatic saw-grinding machine the combination with saw grinding and feedin g mechanis1ns,of a supporting-frame mounting a reciprocating saw-holding table, a sawcentering annulus upon said table, a yielding friction-disk vertically movable, and a capscrew for binding said disk to the table, substantially as described.

8. In an automatic saw-grinding machine the combination with saw grinding and feeding mechanisms, of a supporting-frame, a reciprocating saw-holding table in dovetail relation with said frame, a saw-centering annulus upon the table, a vertically-movable yielding friction-disk, and a cap-screw for binding said disk to the table, substantially as described.

9. In an automatic saw-grinding machine the combination with a pillow-block and a driving-shaft mounting a grinding-wheel, of worm-gearin g positively driven by said shaft, an auxiliary frame adj ustably secured to the pillow-block, a saw-holding table reciprocally mounted upon said auxiliary frame, and a reciprocatin g pitman-rod connecting said table and gearing, substantially as described.

10. In an automatic saw-grinding machine the combination with a pillow-block and a driving-shaft mounting a grinding-wheel, of a gear-case upon the pillow-block, a wormgearing within said case positively actuated by the driving-shaft, an adjustable auxiliary supporting-frame, a saw-holding table reciprocally mounted upon the latter, and an adjustable reciprocating pitman-rod connecting said table and worm-gearing, substantially as described. 7

11. In an automatic saw-grinding machine the combination with a pillow-block and a driving-shaft mounting a grinding-wheel, of incased Worm-gearing positively driven by said shaft, an adjustable auxiliary supporting-frame, a saw-holding table reciprocally mounted upon the latter, a screw-retained friction-disk, a coupling-arm connected with the latter, and a reciprocating pitman-rod connecting said coupling-arm and the wormgearing aforesaid, substantially as described.

12. In an automatic saw-grindingmachine the combination with saw grinding and holding mechanisms, of a supporting-frame, a gage-plate adjustably secured to the frame, and an adjustable spring-pressed pawl secured to said plate havinga plurality of teeth in fixed relation for automatically engaging teeth upon a circular saw and imparting thereto an intermittent rotary motion, substantially as described.

.13. In an automatic saw-grinding machine the combination with saw grinding, holding and feeding mechanisms, of means for intermittently rotating a circular-saw blade comprising a fixed slotted body having a slidebolt, an adjusting-screw in threaded connection with said slide-bolt, and a spring-pawl projecting from said bolt and adapted to engage teeth upon a saw-blade, substantially as described.

14. In an automatic saw-grinding machine the combination with a reciprocating table, of a clam p-disk provided with a yielding friction-face, and a pawl mounted on a fixed point off of the reciprocating table, substam tially as and for the purposes specified.

In testimony whereof I affix my signature,

in presence of two witnesses, this 27th day of December, 1898. JAMES MCCARTHY.

Witnesses:

W. W. HOLMES, B. C. WIEDERHOLD. 

